Generally thought to be an Iron Age fortification but may have been used at later times such as by the Normans when combating the forces of Hereward the Wake.
https://en.wikipedia.org/wiki/Belsar%27s_Hill
In 1923 Cyril Fox (The Archaeology of the Cambridge Region p.137) described it as a circular ring-work 880 feet and 750 feet respectively in long and short diameter, with a single vallum and ditch, lying on the edge of the fen…… The ditch where it and the vallum are most perfect is marshy; and it must when the camp was in use have been a wet moat. Under natural conditions the site must have been very inaccessible.
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